Addition of a(n) group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally ; addition of a(n) group to certain lysine residues makes the region of chromatin transcriptionally

Addition of a(n) methyl group to certain lysine residues of a histone protein makes the region of chromatin transcriptionally silent; addition of a(n) acetyl group to certain lysine residues makes the region of chromatin transcriptionally active.

Explanation:

The changes suffered in the expression and activity of the genes are studied by the Epigenetics.

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